若背景自定义路径是文件夹 则随机在文件夹选取图片展示 (#5769)

Co-authored-by: Glavo <[email protected]>

HMCL/src/main/java/org/jackhuang/hmcl/ui/decorator/DecoratorController.java

@@ -57,13 +57,12 @@ import org.jetbrains.annotations.Nullable;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.Paths;
-import java.util.List;
+import java.util.ArrayList;
 import java.util.Locale;
 import java.util.Random;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import static java.util.stream.Collectors.toList;
 import static org.jackhuang.hmcl.setting.ConfigHolder.config;
 import static org.jackhuang.hmcl.ui.FXUtils.newBuiltinImage;
 import static org.jackhuang.hmcl.ui.FXUtils.onEscPressed;
@@ -194,7 +193,10 @@ public class DecoratorController {
                 String backgroundImage = config().getBackgroundImage();
                 if (backgroundImage != null)
                     try {
-                        image = tryLoadImage(Paths.get(backgroundImage));
+                        Path path = Path.of(backgroundImage);
+                        image = Files.isDirectory(path)
+                                ? randomImageIn(path)
+                                : tryLoadImage(path);
                     } catch (Exception e) {
                         LOG.warning("Couldn't load background image", e);
                     }
@@ -300,14 +302,14 @@ public class DecoratorController {
             return null;
         }
 
-        List<Path> candidates;
+        ArrayList<Path> candidates;
         try (Stream<Path> stream = Files.list(imageDir)) {
             candidates = stream
                     .filter(it -> FXUtils.IMAGE_EXTENSIONS.contains(getExtension(it).toLowerCase(Locale.ROOT)))
                     .filter(Files::isReadable)
-                    .collect(toList());
+                    .collect(Collectors.toCollection(ArrayList::new));
         } catch (IOException e) {
-            LOG.warning("Failed to list files in ./bg", e);
+            LOG.warning("Failed to list files in " + imageDir, e);
             return null;
         }